Pump for sucking liquid, air and solid particles



June 4, 1968 s. G. ERIKSSON 3,386,386

AIR AND SOLID PARTICLES PUMP FOR SUCKING LIQUID,

Filed Feb. 5, 1966 fi//// V/// r/ //k Sven '0. En. ksson ,gyjmombv" United States Patent Oflice 3,33%,336 Patented June 4, 1968 3,386,336 PUMP FUR SUCKING LIQUID, AIR AND SQLID PARTICLES Sven G. Erilrsson, I Svea'vagen, Djursholm, Sweden Filed Feb. 3, 1966, Ser. No. 524,792

Claims priority, application Sweden, Feb. 3, 1965,

,401/65 1 Claim. (Cl. 103-117) ABSTRACT OF THE DISCLQSURE The invention relates to a pump for use, for example, by dentists, for clearing the mouth of saliva and bone splinters and the like and which remains operative even when only air is present, the said pump having a continual liquid supply to maintain it primed, under all conditions.

This invention relates to a pump for sucking liquid, air and solid particles and is, as the device according to the main patent, adapted for use in connection with surgical and dental operations for removing blood, saliva, bone splinters, metal particles, dust particles produced in the driiling of teeth, and air by sucking, but may also be applied to a plurality of other application fields.

According to an embodiment in the main patent, a rotor with radial flanges mounted concentrically in a pump rousing cooperates with an insert. The insert comprises two or more inwardly cylindrical sector surfaces with different radii and with one or several inlets arranged in said sectors.

The pump according to the present application is a development of the main patent. The pump housing comprises two inserts which act independently of one another, and the pump has two inlets and two outlets. Hereby the pump forms in a single unit two independent pumps. It was proved by experiments that this double-pump runs more uniformly because of the pressure acting from both sides on the rotor, and at the same time is given a greater volume per minute at the same motor effect.

The invention is described in greater detail in the following, with reference to the accompanying drawing which shows by way of example a selected embodiment of the invention. The details having correspondence in the main patent are designated by the same reference numerals.

In a pump housing 1 a rotor 2 of elastic material is mounted. The rotor 2 is provided with flanges 3 effecting the sucking action of the pump by pressing slightly against the inner wall of the pump housing 1 during a part of a turn of the rotating rotor, which flanges during the remaining part of the turn are subjected to a strong inward deflection by being pressed against insert 4 in the pump housing, which inserts are disposed in the rotating direction of the rotor after the outlet lines 5 and 12 respectively of the pump but before its inlet lines 6 and 13 respectively. The inlet lines 6, 13 of the pump are adapted for connection, for example, to one or several suction nozzles (not shown) which may be arranged at a long distance from the pump.

In the embodiment shown, the upper insert 4 is of such inward concave design that the smallest distance r between the bearing shaft 7 of the rotor 2 and the insert before the inlet 8 for the supply of liquid is smaller than the corresponding distance R after the said inlet 8, whereby sucking action through the inlet is effected. The surfaces of the upper insert 4 before and after the inlet 8 are preferably made cylindrical, the radii r and R respectively with their centre of curvature coinciding with the central shaft of the rotor 2, while the lower insert 4 can be given a surface the curvature of which is formed by a radius having the centre in the central shaft of the rotor 2.

For ensuring effective operation of the pump, the rotor 2 must be provided with a number of flanges 3 which is somewhat greater than the number of flanges required in the device according to the main patent.

The inlet 8 is connected by a line 9 with a container 10, whereby water can be supplied without requiring direct connection between the inlet 8 and the water main. In the embodiment shown, the outlet line 5 is connected to the container 10 which has an outlet 12.

As in the device according to the main patent, also this pump can be provided with a pressure switch 11 connected at the container 10 for ensuring that there is always Water supply to the pump. The switch 11 is controlled by the water level.

The invention according to this application for a patent of addition can be varied, in the first hand in the same way as disclosed in the main patent, and, of course, also this invention may be provided with more inserts 4 than the two shown, in which case, however, every insert must have an inlet and an outlet line.

The rotor 2 though being described to be of elastic material may, of course, also be made of metal with movable blades in cases when the pump is intended to operate with oil as liquid, the oil being the lubricant between the blades and the wall of the pump housing.

What I claim is:

1. A pump for pumping fiuid including gases comprising a housing provided with at least two inlet and two outlet conduits connected thereto alternately at angularly spaced locations and arranged in pairs of an inlet and an outlet, a rotor disposed substantially centrally in said housing, said rotor having a plurality of radially extending flexible vanes spaced apart angularly at intervals less than the angular spacing of said inlets and outlets of said pairs, insert arranged in said housing and located between each pair of inlet and outlets, a vessel containing liquid having a conduit connected to said housing nitermediate one of said inlets and outlets, said last-mentioned conduit entering said housing at a location intermediate one of said inserts and passing through a passage formed in said insert adjacent said last-mentioned conduit, said one of said inserts having curved interior faces, one located behind said passage and being of smaller radius than the face located after said passage to induce a sucking action through said passage and conduit from said vessel to supply said pump with liquid to ensure pumping effect when the pump is pumping gas.

References Cited UNITED STATES PATENTS 1,804,604 5/1931 Gilbert 1032 XR 2,280,272 4/ 1942 Sullivan 1037 2,663,263 12/1953 Mayus et al. 3,014,429 12/1961 Doble. 3,161,135 12/ 1964 Eriksson. 3,289,591 12/1966 Eriksson.

DONLEY J. STOCKING, Primary Examiner.

T. R. HAMPSHIRE, Assistant Examiner. 

